Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities:
Net income (loss)	$ 184,975	$ (266,785)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	109,111	114,006
Amortization of debt issuance costs and discounts	4,842	3,279
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs	52,011
Deferred income tax provision (benefit)	8,892	(21,305)
Equity-based compensation	23,156	3,203
Other, including loss on sale or disposal of assets, net	3,121	326
Changes in assets and liabilities:
Accounts receivable	(73,695)	30,391
Inventories	4,938	(1,001)
Prepaid expenses and other current assets	1,667	(742)
Accounts payable and accrued expenses	27,969	6,856
Accrued salaries, wages and benefits	11,587	(3,375)
Deferred revenue	58,643	24,973
Other accrued liabilities	1,287	3,659
Right-of-use assets and operating lease liabilities	314	418
Other assets and liabilities	(2,381)	(1,552)
Net cash provided by (used in) operating activities	416,437	(107,649)
Cash Flows From Investing Activities:
Capital expenditures	(73,591)	(75,715)
Net cash used in investing activities	(73,591)	(75,715)
Cash Flows From Financing Activities:
Proceeds from issuance of debt, net	1,922,222	713,658
Repayments of long-term debt	(2,029,728)	(11,629)
Proceeds from draws on revolving credit facility		272,500
Repayments of revolving credit facility		(322,500)
Purchase of treasury stock	(77,566)	(12,406)
Payment of tax withholdings on equity-based compensation through shares withheld	(12,699)	(3,350)
Exercise of stock options	4,565	365
Debt issuance costs	(23,142)	(2,467)
Other financing activities	(6,565)	(1,861)
Net cash (used in) provided by financing activities	(222,913)	632,310
Change in Cash and Cash Equivalents, including Restricted Cash	119,933	448,946
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	435,225	40,925
Cash and Cash Equivalents, including Restricted Cash—End of period	555,158	489,871
Supplemental Disclosure of Noncash Investing and Financing Activities:
Capital expenditures in accounts payable	22,094	33,925
Other financing arrangements	$ 4,239	$ 2,837